I refer to this pattern https://ravel.me/crochet-boa-snake for four rows in total (it’s linked in the pdf and I tell you which of the rows to make). The linked pattern is by Lisa Sommers: https://www.ravelry.com/people/lisasommers

You can make this pattern with any yarn and corresponding hook. I recommend a thin yarn for the snake tongue tho.

A temperature snake is very customizable, so the amount of yarn & colors depends on you personal choice.